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linux/sound/isa/sb/sb8_midi.c
Thomas Gleixner 1a59d1b8e0 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version this program is distributed in the
  hope that it will be useful but without any warranty without even
  the implied warranty of merchantability or fitness for a particular
  purpose see the gnu general public license for more details you
  should have received a copy of the gnu general public license along
  with this program if not write to the free software foundation inc
  59 temple place suite 330 boston ma 02111 1307 usa

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 1334 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:35 -07:00

267 lines
7.5 KiB
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
* Routines for control of SoundBlaster cards - MIDI interface
*
* --
*
* Sun May 9 22:54:38 BST 1999 George David Morrison <gdm@gedamo.demon.co.uk>
* Fixed typo in snd_sb8dsp_midi_new_device which prevented midi from
* working.
*
* Sun May 11 12:34:56 UTC 2003 Clemens Ladisch <clemens@ladisch.de>
* Added full duplex UART mode for DSP version 2.0 and later.
*/
#include <linux/io.h>
#include <linux/time.h>
#include <sound/core.h>
#include <sound/sb.h>
irqreturn_t snd_sb8dsp_midi_interrupt(struct snd_sb *chip)
{
struct snd_rawmidi *rmidi;
int max = 64;
char byte;
if (!chip)
return IRQ_NONE;
rmidi = chip->rmidi;
if (!rmidi) {
inb(SBP(chip, DATA_AVAIL)); /* ack interrupt */
return IRQ_NONE;
}
spin_lock(&chip->midi_input_lock);
while (max-- > 0) {
if (inb(SBP(chip, DATA_AVAIL)) & 0x80) {
byte = inb(SBP(chip, READ));
if (chip->open & SB_OPEN_MIDI_INPUT_TRIGGER) {
snd_rawmidi_receive(chip->midi_substream_input, &byte, 1);
}
}
}
spin_unlock(&chip->midi_input_lock);
return IRQ_HANDLED;
}
static int snd_sb8dsp_midi_input_open(struct snd_rawmidi_substream *substream)
{
unsigned long flags;
struct snd_sb *chip;
unsigned int valid_open_flags;
chip = substream->rmidi->private_data;
valid_open_flags = chip->hardware >= SB_HW_20
? SB_OPEN_MIDI_OUTPUT | SB_OPEN_MIDI_OUTPUT_TRIGGER : 0;
spin_lock_irqsave(&chip->open_lock, flags);
if (chip->open & ~valid_open_flags) {
spin_unlock_irqrestore(&chip->open_lock, flags);
return -EAGAIN;
}
chip->open |= SB_OPEN_MIDI_INPUT;
chip->midi_substream_input = substream;
if (!(chip->open & SB_OPEN_MIDI_OUTPUT)) {
spin_unlock_irqrestore(&chip->open_lock, flags);
snd_sbdsp_reset(chip); /* reset DSP */
if (chip->hardware >= SB_HW_20)
snd_sbdsp_command(chip, SB_DSP_MIDI_UART_IRQ);
} else {
spin_unlock_irqrestore(&chip->open_lock, flags);
}
return 0;
}
static int snd_sb8dsp_midi_output_open(struct snd_rawmidi_substream *substream)
{
unsigned long flags;
struct snd_sb *chip;
unsigned int valid_open_flags;
chip = substream->rmidi->private_data;
valid_open_flags = chip->hardware >= SB_HW_20
? SB_OPEN_MIDI_INPUT | SB_OPEN_MIDI_INPUT_TRIGGER : 0;
spin_lock_irqsave(&chip->open_lock, flags);
if (chip->open & ~valid_open_flags) {
spin_unlock_irqrestore(&chip->open_lock, flags);
return -EAGAIN;
}
chip->open |= SB_OPEN_MIDI_OUTPUT;
chip->midi_substream_output = substream;
if (!(chip->open & SB_OPEN_MIDI_INPUT)) {
spin_unlock_irqrestore(&chip->open_lock, flags);
snd_sbdsp_reset(chip); /* reset DSP */
if (chip->hardware >= SB_HW_20)
snd_sbdsp_command(chip, SB_DSP_MIDI_UART_IRQ);
} else {
spin_unlock_irqrestore(&chip->open_lock, flags);
}
return 0;
}
static int snd_sb8dsp_midi_input_close(struct snd_rawmidi_substream *substream)
{
unsigned long flags;
struct snd_sb *chip;
chip = substream->rmidi->private_data;
spin_lock_irqsave(&chip->open_lock, flags);
chip->open &= ~(SB_OPEN_MIDI_INPUT | SB_OPEN_MIDI_INPUT_TRIGGER);
chip->midi_substream_input = NULL;
if (!(chip->open & SB_OPEN_MIDI_OUTPUT)) {
spin_unlock_irqrestore(&chip->open_lock, flags);
snd_sbdsp_reset(chip); /* reset DSP */
} else {
spin_unlock_irqrestore(&chip->open_lock, flags);
}
return 0;
}
static int snd_sb8dsp_midi_output_close(struct snd_rawmidi_substream *substream)
{
unsigned long flags;
struct snd_sb *chip;
chip = substream->rmidi->private_data;
del_timer_sync(&chip->midi_timer);
spin_lock_irqsave(&chip->open_lock, flags);
chip->open &= ~(SB_OPEN_MIDI_OUTPUT | SB_OPEN_MIDI_OUTPUT_TRIGGER);
chip->midi_substream_output = NULL;
if (!(chip->open & SB_OPEN_MIDI_INPUT)) {
spin_unlock_irqrestore(&chip->open_lock, flags);
snd_sbdsp_reset(chip); /* reset DSP */
} else {
spin_unlock_irqrestore(&chip->open_lock, flags);
}
return 0;
}
static void snd_sb8dsp_midi_input_trigger(struct snd_rawmidi_substream *substream, int up)
{
unsigned long flags;
struct snd_sb *chip;
chip = substream->rmidi->private_data;
spin_lock_irqsave(&chip->open_lock, flags);
if (up) {
if (!(chip->open & SB_OPEN_MIDI_INPUT_TRIGGER)) {
if (chip->hardware < SB_HW_20)
snd_sbdsp_command(chip, SB_DSP_MIDI_INPUT_IRQ);
chip->open |= SB_OPEN_MIDI_INPUT_TRIGGER;
}
} else {
if (chip->open & SB_OPEN_MIDI_INPUT_TRIGGER) {
if (chip->hardware < SB_HW_20)
snd_sbdsp_command(chip, SB_DSP_MIDI_INPUT_IRQ);
chip->open &= ~SB_OPEN_MIDI_INPUT_TRIGGER;
}
}
spin_unlock_irqrestore(&chip->open_lock, flags);
}
static void snd_sb8dsp_midi_output_write(struct snd_rawmidi_substream *substream)
{
unsigned long flags;
struct snd_sb *chip;
char byte;
int max = 32;
/* how big is Tx FIFO? */
chip = substream->rmidi->private_data;
while (max-- > 0) {
spin_lock_irqsave(&chip->open_lock, flags);
if (snd_rawmidi_transmit_peek(substream, &byte, 1) != 1) {
chip->open &= ~SB_OPEN_MIDI_OUTPUT_TRIGGER;
del_timer(&chip->midi_timer);
spin_unlock_irqrestore(&chip->open_lock, flags);
break;
}
if (chip->hardware >= SB_HW_20) {
int timeout = 8;
while ((inb(SBP(chip, STATUS)) & 0x80) != 0 && --timeout > 0)
;
if (timeout == 0) {
/* Tx FIFO full - try again later */
spin_unlock_irqrestore(&chip->open_lock, flags);
break;
}
outb(byte, SBP(chip, WRITE));
} else {
snd_sbdsp_command(chip, SB_DSP_MIDI_OUTPUT);
snd_sbdsp_command(chip, byte);
}
snd_rawmidi_transmit_ack(substream, 1);
spin_unlock_irqrestore(&chip->open_lock, flags);
}
}
static void snd_sb8dsp_midi_output_timer(struct timer_list *t)
{
struct snd_sb *chip = from_timer(chip, t, midi_timer);
struct snd_rawmidi_substream *substream = chip->midi_substream_output;
unsigned long flags;
spin_lock_irqsave(&chip->open_lock, flags);
mod_timer(&chip->midi_timer, 1 + jiffies);
spin_unlock_irqrestore(&chip->open_lock, flags);
snd_sb8dsp_midi_output_write(substream);
}
static void snd_sb8dsp_midi_output_trigger(struct snd_rawmidi_substream *substream, int up)
{
unsigned long flags;
struct snd_sb *chip;
chip = substream->rmidi->private_data;
spin_lock_irqsave(&chip->open_lock, flags);
if (up) {
if (!(chip->open & SB_OPEN_MIDI_OUTPUT_TRIGGER)) {
mod_timer(&chip->midi_timer, 1 + jiffies);
chip->open |= SB_OPEN_MIDI_OUTPUT_TRIGGER;
}
} else {
if (chip->open & SB_OPEN_MIDI_OUTPUT_TRIGGER) {
chip->open &= ~SB_OPEN_MIDI_OUTPUT_TRIGGER;
}
}
spin_unlock_irqrestore(&chip->open_lock, flags);
if (up)
snd_sb8dsp_midi_output_write(substream);
}
static const struct snd_rawmidi_ops snd_sb8dsp_midi_output =
{
.open = snd_sb8dsp_midi_output_open,
.close = snd_sb8dsp_midi_output_close,
.trigger = snd_sb8dsp_midi_output_trigger,
};
static const struct snd_rawmidi_ops snd_sb8dsp_midi_input =
{
.open = snd_sb8dsp_midi_input_open,
.close = snd_sb8dsp_midi_input_close,
.trigger = snd_sb8dsp_midi_input_trigger,
};
int snd_sb8dsp_midi(struct snd_sb *chip, int device)
{
struct snd_rawmidi *rmidi;
int err;
if ((err = snd_rawmidi_new(chip->card, "SB8 MIDI", device, 1, 1, &rmidi)) < 0)
return err;
strcpy(rmidi->name, "SB8 MIDI");
snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &snd_sb8dsp_midi_output);
snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &snd_sb8dsp_midi_input);
rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT | SNDRV_RAWMIDI_INFO_INPUT;
if (chip->hardware >= SB_HW_20)
rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;
rmidi->private_data = chip;
timer_setup(&chip->midi_timer, snd_sb8dsp_midi_output_timer, 0);
chip->rmidi = rmidi;
return 0;
}
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